Supplementary Material

Supporting materials are available online: SEM images of p-MWNTs and m-MWNTs,
EDS spectrum of m-MWNTs, TEM images of p-MWNTs and samples prepared in the
control experiments, photographs of m-MWNTs and m-MWNT@Pt, elemental map of
m-MWNT@Pt, and the results of the reduction of 4-nitrophenol into 4-aminophenol with
the catalyst of m-MWNTs@Pt for cycles 2–15.